| 1 | /* Common definition for ifunc selections optimized with SSE2 and SSE4.2. |
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| 2 | All versions must be listed in ifunc-impl-list.c. |
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| 3 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #include <init-arch.h> |
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| 21 | |
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| 22 | extern __typeof (REDIRECT_NAME) OPTIMIZE (generic) attribute_hidden; |
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| 23 | extern __typeof (REDIRECT_NAME) OPTIMIZE (sse42) attribute_hidden; |
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| 24 | |
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| 25 | static inline void * |
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| 26 | IFUNC_SELECTOR (void) |
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| 27 | { |
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| 28 | const struct cpu_features* cpu_features = __get_cpu_features (); |
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| 29 | |
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| 30 | /* This function uses the `pcmpstri` sse4.2 instruction which can be |
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| 31 | slow on some CPUs. This normally would be guarded by a |
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| 32 | Slow_SSE4_2 check, but since there is no other optimized |
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| 33 | implementation its best to keep it regardless. If an optimized |
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| 34 | fallback is added add a X86_ISA_CPU_FEATURE_ARCH_P (cpu_features, |
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| 35 | Slow_SSE4_2) check. */ |
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| 36 | if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSE4_2)) |
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| 37 | return OPTIMIZE (sse42); |
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| 38 | |
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| 39 | return OPTIMIZE (generic); |
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| 40 | } |
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| 41 | |
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